Otocinclus
Ottos The Algae Eaters, © Thomas Buck
Origin: Southeastern Brazil
Temp: 68 - 73°F (20 - 23°C)
pH: 6 - 8 dH: Not Critical
Temperament: Very easygoing
Adult Size: 1 1/2 in (4 cm)
Minimum Tank Size: 2 gallon
Feeding: Eats primarily algae, will consume flakes and other normal fish foods in a pinch
Breeding: Similar to Corydoras
Comments: A nice fish to have if you have any problems with algae. It is harmless to other fish. Note it's preference for low temperatures.